Kent County, RI radon potential

EPA's own radon map rates Kent County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally that's the 97th percentile for radon potential — Kent County outranks 97% of every county EPA has rated.

Kent County by the numbers

Kent County, Rhode Island is home to about 172,450 people across 168.568 square miles. That works out to roughly 1,023 people per square mile. Within its own EPA zone, Kent County is bigger by population than 90% of the counties that share it. EPA's geology-based Region 1 groups Kent County with 58 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Kent County

Kent County's predicted average sits above EPA's own action level of 4 pCi/L — the concentration at which EPA recommends fixing a home — versus a national average around 1.3 pCi/L indoors and 0.4 pCi/L outdoors. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Kent County will test well under the action level, and EPA's guidance is to test regardless of zone.

Next steps for a home in Kent County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Rhode Island's state radon program

For Kent County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Kent County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Kent County's figures come from

Kent County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.